document.write( "Question 1094676: 5 years ago the sum of ages of father and son was 30 and 5 years hence father's ages is 5 yrs more than the double of son's age.find their present ages
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Algebra.Com's Answer #709289 by josmiceli(19441)\"\" \"About 
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Let \"+a+\" = father's age now
\n" ); document.write( "Let \"+b+\" = son's age now
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\n" ); document.write( "(1) \"+%28+a+-+5+%29+%2B+%28+b+-+5+%29+=+30+\"
\n" ); document.write( "(2) \"+a+%2B+5+=+2%2A%28+b+%2B+5+%29+%2B+5+\"
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\n" ); document.write( "(1) \"+a+%2B+b+-+10+=+30+\"
\n" ); document.write( "(1) \"+a+%2B+b+=+40+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+a+%2B+5+=+2b+%2B+10+%2B+5+\"
\n" ); document.write( "(2) \"+a+-+2b+=+10+\"
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\n" ); document.write( "Subtract (2) from (1)
\n" ); document.write( "(1) \"+a+%2B+b+=+40+\"
\n" ); document.write( "(2) \"+-a+%2B+2b+=+-10+\"
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\n" ); document.write( "\"+3b+=+30+\"
\n" ); document.write( "\"+b+=+10+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+a+%2B+10+=+40+\"
\n" ); document.write( "(1) \"+a+=+30+\"
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\n" ); document.write( "The father is 30 and the son is 10
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\n" ); document.write( "check:
\n" ); document.write( "(2) \"+a+-+2b+=+10+\"
\n" ); document.write( "(2) \"+30+-+2%2A10+=+10+\"
\n" ); document.write( "(2) \"+30+-+20+=+10+\"
\n" ); document.write( "(2) \"+10+=+10+\"
\n" ); document.write( "OK
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